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A101036 Weasel numbers: Riesel numbers (n such that n*2^k - 1 is composite for all k >= 1), under the unproved assumption that a Riesel number can be certified by finding a periodic sequence p of prime divisors with p(k) | n*2^k-1. +0
3
509203, 762701, 777149, 790841, 992077, 1106681, 1247173, 1254341, 1330207, 1330319, 1715053, 1730653, 1730681, 1744117, 1830187, 1976473, 2136283, 2251349, 2313487, 2344211, 2554843, 2924861, 3079469, 3177553, 3292241, 3419789, 3423373, 3580901 (list; graph; listen)
OFFSET

1,1

LINKS

David W. Wilson, Table of n, a(n) for n = 1..89

CROSSREFS

See A076337 for references and additional information. Cf. A076336.

Sequence in context: A157759 A124945 A076337 this_sequence A123321 A147574 A046325

Adjacent sequences: A101033 A101034 A101035 this_sequence A101037 A101038 A101039

KEYWORD

nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net), Jan 17 2005

EXTENSIONS

As far as 3292241, checked by Don Reble (djr(AT)nk.ca), Jan 17 2005, who comments that up to this point each n*2^k-1 has a prime factor <= 241.

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Last modified November 25 13:47 EST 2009. Contains 167481 sequences.


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